RAID 1 Disk Failure

[xeryus]

I have a RAID 1 SCSI Array and a drive failed. Do I have to break the mirrors or can I just pull out the failed drive and insert the new drive in? What steps are needed to replace the failed drive? I have no idea what to do? Help!!!
AIX 4.3.3

Thanks in Advance.

 

[flatwater]

If the disk is completely mirrored, then to replace hdisk1 from an hdisk0/hdisk1 mirror:

1. unmirror rootvg hdisk1 (remove copies from disk)
2. chpv -c hdisk1 (clear boot image so it doesn't try to boot)
3. bosboot -ad /dev/hdisk0 (create new boot image)
4. bootlist -m normal hdisk0 (boot only from hdisk0)
5. reducevg rootvg hdisk1 (remove hdisk1 from the rootvg)
6. rmdev -dl hdisk1 (remove device from ODM)
7. physically remove/replace bad disk
8. mirrorvg rootvg (by default creates 2 copies onto replaced disk)
9. bosboot -ad /dev/ipldevice (new boot image - ipldevice can be used instead of the actual disk)
10. bootlist -m normal hdisk0 hdisk1 (reset bootlist for both disks)